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Maybe calling it a local issue is a bit unfair. In London as a whole rail is responsible for 8% of all NOx emissions. This is the same as all TFL buses and four times that of taxis. Much publicity and legislation is being directed at these two latter polluters, little or nothing is being...

If you want to know why I am interested in any possibility of lowering the pollution levels at Marylebone Station, by reducing idling and replacing the use of diesel, read this from a resident. For those of you who say that she shouldn't have chosen to live there in the first place, remember the...

I am expecting that, when the current Chiltern franchise comes up for renewal, the updated conditions will include the requirement to switch diesel to new, much less polluting fuels, such as GTL, and battery power where practical. I am actually hoping that this Chiltern would make this move...

1: Is the prime mover able to burn said fuel. 2: How much would any conversion cost. 3: If conversion and use is not manufacturer approved, what happens with warranty claims. 4: Will there be an increase in maintenance. 5: What would be the potential for failures. 6: Increase in...

Looking to the future I was hoping that this fuel might replace diesel in locos and DMUs (you know my interest in Marylebone Station). I believe it is already in use abroad and there are no conversion costs as it is a straight substitution.

You were all very helpful in the past. Could you help with this question, please? Is there any prospect of diesel trains being transferred to run on GTL fuel? I believe that there is no conversion cost.

Apologies. I never acknowledged your very informative response. I can't find the you tube video to which you refer. Do you have a link, please?

But Chiltern do run non-loco services to Birmingham I think. I think they are 168s. Are these not DMUs? Could not they be coupled together?

Now I follow. Thanks, both of you.

What's that all about? I see it every day. Coupling and uncoupling DMUs at Marylebone is an everyday thing. Just didn't know how it all worked. Now I do. Have I missed your joke or something?

Ah. Stupid me !!

And, presumably, if you couple two sets of three together you will have a car with a driving cab in the middle, too.

Sorry. Letters crossed. I understand now except to ask, does each set have to have a driving cab at each end, or can it arrive at Marylebone with one at the front only, and another one get coupled to the other end for departure? And, to bring us back to residents issues (and sorry if this...

Would each car have an engine and a driving cab, even if it was the middle one of a set of three? I presume not every car can be driven seperately, or can it? How are they configured? Sorry if these seem basic questions.

Can you help me please? Can't get my head round this. Re DMUs. Is every carriage within a set a DMU or are there seperate carriages as well? eg does a four carriage 168 Clubman set comprise 2 DMUs and 2 carriages? And is that a set configaration or can it be altered to a 3 carriage set? On...

Accepted. Nothing we can do at present. Is there any way that one could say with any degree of certainty that,say, the NOx emissions resulting from 25 minutes of idling by a Class 68 loco were greater or less than that from, say, a 168 or 165 idling for 10 minutes? If not, does anyone...

Will Chiltern be forced to replace/refurbish their existing DMU fleet to comply with Stage 111b requirements or does it only apply to replacement by reason of age?

Thank you coppercapped, your explanation has been invaluable. As all you kind contributors realise, I am just Joe Public with no real rail knowledge and relient on your expertise to help see the residents through to a more satisfactory position. The difference between the use of DMUs and...

Yes, I would like to move on to emissions, but bear in mind the need to keep noise down as much as possible. When the DMUs are replaced I don't (on the grounds of noise) want them replaced with 68s if it can be avoided. Will it really be necessary to use these powerful, mixed traffic...

Ah. I see. Ignorant of me. Are the harmful emissions therein, or do they have a seperate outlet? I believe there is growing pressure for a new Clean Air Act to catch carcingenic emissions.. I suppose railways will be exempt.